io.github.mmm.crypto.asymmetric.sign.SignatureSignerImplWithHash Maven / Gradle / Ivy

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package io.github.mmm.crypto.asymmetric.sign;

import io.github.mmm.crypto.algorithm.CryptoAlgorithm;
import io.github.mmm.crypto.hash.HashCreator;

/**
 * Implementation of {@link SignatureSigner} combining a {@link HashCreator} with another
 * {@link SignatureSigner}.
 *
 * @param  type of {@link SignatureBinary}.
 * @author Joerg Hohwiller (hohwille at users.sourceforge.net)
 * @since 1.0.0
 */
public class SignatureSignerImplWithHash extends SignatureProcessorImplWithHash
    implements SignatureSigner {

  private final SignatureSigner signer;

  /**
   * The constructor.
   *
   * @param hashGenerator the {@link HashCreator} to apply as extension.
   * @param signer the {@link SignatureSigner} to extend.
   */
  public SignatureSignerImplWithHash(HashCreator hashGenerator, SignatureSigner signer) {

    super(hashGenerator);
    this.signer = signer;
  }

  @Override
  protected CryptoAlgorithm getSignatureAlgorithm() {

    return this.signer;
  }

  @Override
  public S signAfterUpdate(boolean reset) {

    byte[] hash = getHashGenerator().hash(true);
    return this.signer.sign(hash, reset);
  }

  @Override
  public byte[] signAfterUpdateRaw(boolean reset) {

    byte[] hash = getHashGenerator().hash(true);
    this.signer.update(hash);
    byte[] signature = this.signer.signAfterUpdateRaw(reset);
    return signature;
  }

  @Override
  public void reset() {

    super.reset();
    this.signer.reset();
  }

}